Ore-concentrator.



0.- I. GLASSBROOK.

ORE GONGENTRATOR.

APPLICATION FILED nuns, 1911.

Patented S'ept. 1'7, 1912.

@SHEBTB-BHEET 1.

9%.. :Z w m 3 0. I. GLASSBROOK.

ORE GONGENTRATOR APPLICATION FILED FEB. 9, 1911.

Patented Sept. 17, 1912.

4 SHEETS-SHEET 2.

afar/my C. I. GLASSBROOK.

ORE GONGBNTRATOR.

ABPLIOATIOH FILED FEB. s, 1911.

Patented Sept. 17,1912.

4-SHEEIS-SHEET a.

k iia i Clarence Z. GlassZroo/fi C. I. GLASSBROOK. ORE CONCENTRATOR.

- APPLIOAIIONiILBD FEB. 9, 1s11.

Patented Sept. 17

4 SHEETS-SHEET 4.

run s'rarns PATENT CLARENCE I. GLA$SBROOK, OF SALT LAKE CITY, UTAH.

ORE-GONCENTRATOR.

Specification of Letters Patent. Patented! Sept 1?, 1912.

Application filed February 9, 1911. Serial No. 607,559.

To all whom it may concern:

Be it known that l, CLARENCE I. Grass- BROOK, a citizen of the United States, residing at Salt Lake City, in the county of Salt Lake and State of Utah, have invented cer:

tain new and'uscful Improvements in Orc Concentrators, of which the following is a specification.

' This invention relates to certain new and ,useful improvements in machines for the concentration of ore and particularly ore having valuable constituents, as gold and silver, such machines being provided with mechanism for imparting to the concentrating tables, a vibratory motion for causing the ore particles to be advanced progressively over the table to a point of discharge.

The present invention consists of the parts, andthe constructions, arrangements enlarged side. elevation of the adjustable, head mechanism. Fig. 5 is a front elevation of Fig. 4.. Fig. 6 is a diagrammaticshowing hereinafter-referred to. Fig. 7 is a detailto be referred to.

In carrying out my invention I construct the machine with a main concentrating table, T, which is adapted for reciprocal inoven'ient and is connected with means by which the table may be leveled and which means and the specific character of which table I. will hereinafter describe. This table is connected with a mechanism for operating the table and imparting thereto such movement that the ore partlcles Wlll be progressively moved over the table toward the frtnt or head-end thereof, and which mechanism I willnow descrlbe, referenc'ebei'ng had to Figs. 1, 4 and 5 ofthe drawings.

Upon a suitable bed or foundation, 10, is.

appropriately secured or mounted a cast frame'nndbase, 11, upon which suitable pedestals, 12, are mounted, these pedestals being adapted to support in appropriate ]ournal boxes, the ends of a crank shaft, 18, said shaft having secured to it, a pitman, 14, which in turn is connected to a rocker, in the form of alink, 15, which is connected with a pin, 16, carried by the pitman; the

lower end of the rocker, or link, is connected to square or parallel-sided bearing blocks, 17, by means of a pin or shaft, 18. The bearing blocks, 17, are preferably square in cross section or in any event" they should have parallel vertical sides to operate with a sliding movement between appropriate vertical guide posts or slotted standards, 19,

and 19, when moved up and down by the mechanism which I will presently describe,

.said bearing blocks being supported on suitable springs, 20, the purpose of which is to hold these hearings against the lower edge of a wedge, 21, at all times. This Wedge is movably mounted and is duplex in character, there being a wedge portion on each side of the rocker or link, 15, a'sshown in Figs. 1 and 5, said wedge portions being connected together at their rear ends bFa solid piece of metal forming a circular back, 22, into which back is inserted the horizontal screw, 23, appropriately mounted in a bracket, 2:},

bolted-or otherwise secured to the base frame, as by means of cap screws, as shown. By-means of theaforesaid screw, 23, the double-wedge may be moved in and out in a horizontal plane and be securely held in its adjusted position. The wedge, 21, has for its permanent upper bearing the slides, 25, as shown in :Figs. 4 and 5, which overhang the upper end of said wedge portions, the bearing being sufficiently long to give the wedge a support for substantially its entire surface in any position in which. the

,sfaid'wedge may be moved. The wedge is urther provided with a flange, 26, which is designed as a stop, to prevent. the wedge from being inserted farther than the point at which the'flange thereof comes in contact-- with the bearing blocks, 17, which bearing blocks are beveled on the upper su'rfaccsto accommodate them to the inclination or angle of the Wedge at the point of'contact.

'In'order that the head-mechanism may be operatively cbnnected to the concentrating table. A, and more partipularly that L inay;

form an adjustable connection between the head-mechanism and the'table and thereby control or adjust the stroke of said, mechanism I employ the following device, shown particularly in Figs. 3 and 4. A movable attachment, 27, is adjustably mounted on a vertical screw, 28, which is in turnmounted on a projecting member or lug, 29, which forms a part of the rocker or link, 15, before mentioned, said attachment being provided with a square headed and collared screw, 30, shown in Fig. 4, to which, a nut, 31, is engaged and by means of which the attachment, 27, may be permanently locked to the aforesaid rocker or link 15, which latter is provided witha central slot, 32, toaccommodate the movable attachment, as shown in Fig. 5. The attachment is also provided with a steel pin, 33, by means of which a connecting rod, 3 1, is attached leading from the concentrating table, said rod being the medium by which the reciprocating motion is transmitted from the head-mechanism to said table.

Owing to the attachment being provided with the lug or nut, 29, on which is mounted the screw, 28, it is quite evident that said attachment may be moved up and down and fastened at any point on the rocker or linkconnection, 15, between a position which is substantially close to the lower bearing pin, 18, which'is the print of least motion, to a position near the upper bearing pin, 16, which may represent the point of greatest 'motion, and by this adjustment I am able to impart to the table any degree of stroke or reciprocating motion desired and within the range of the maximum and minimum movement produced by the rocker or link, 1.5,when it is actuated by the crank 13, and the connecting pitman, 1 1, the maximum and minimum movement hereinafter referred to being illustrated in part by the dotted lines in Fig. 4:.

I Will statesthat the vertical position of the rocker, 15, which controls the position or angle ofthe connecting pitman, deter mines the quantity or quality of differential or progressive motion that is imparted to the concentrating table and that this is more important than the length of the stroke which may be given the table, although both operations are important and it is especially desired that the mechanism be so arranged that the parts may be adjusted separately. I have heretofore explained how the length of the stroke can be adjusted and I will now explain the quick return or ])POgIQSSiV&'11lO tion which is produced by my invention, and which progressive motion is determined by the angle formed by the pitman, 14;. and rocker, 15.

By reference to Fig. 4, it will be under stood that if the rocker, 15, be elevated until the position of the pitmanis exactly at a right angle from its connection with the crank-shaft to its connection with the rocker, thus forming an'angle of 90, the

period (if time required for the rocker to move front and back in response to the revolving crank. 13, would be exactly the same, but as the rocker is allowed to drop vertically, it being forced down, by the double-wedge, 21, .itthus causes the pitman, 14,

to assume an angle of say about 15 from the horizontal and the rocker will be drawn back toward the crank more quickly or .in

less time than that required to push it out or into itsfirst-mentioned posit-ion. In this description the crank is supposed to be revolving in the direction'indicated by the arrow, in Fig. 4; reversing the direction of the crank revolution, the quick-motion will be reversed. The nearer the position of the pitman is allowed to approach a straight line with the rocker, 15, the uickerwill be the return movement. of t e connecting point at the bearing pin, 16. From this description it will be apparent that the angle of relation between the pitm'an and rocker determines the degree or percentage of differential or progressive movement, and this angle is adjusted by means of the vertical or nearly vertical position of the rocker up or down which is governed by t ewedge, 21, before mentioned.

The diagrammatic drawing, Fig. (S'contains several diagrams representing different positions of the rocker and the relative position of the pitman. In this diagram,

the circle, D, represents the rocker pin bearing, 18. The circle, A, represents the line traveled by the center of the crank, 13. The line C, represents the arc line described by the travel of the pitman and rocker connecting pin, 16. The circle, A, is divided into eight equal parts indicated by the lines, 1, 2, 3, 4, 5, 6, 7 and 8; each of these lines indicates a position of the center of the crank in making one complete revolution. The ,intersecting lines crossing the line, C, repre sent the corresponding position of the upper bearing pin, 16, as shown by the aforesaid lines l', 2, 8, 4;, 5, 6, 7 and 8. It will be noterl that starting at point 1 on the circle, A, and advancing to point 5, or one half of a revo: .lntion of the crank, 13, that the spaces trav eled on the arc-line, C, are much greater between the intersecting lines, 2, 3 and 4, than the spaces shown between the intersecting lines, 6, 7 and 8, which latter represent the points traveled bythe bearing pin, 16, as it is thrust back to the point of starting by the second half ofthe resolution of the crank. 13. The distance between the intersecting lines, 4t and 6, as shown on the extended line, B, in the first of the diagrams mentioned,,represent the difference in the distance traveled by the rocker, 15, in the-same period of time during the first half of the crank revolution as compared withthe return or second half of the'complete revolutlon.

Diagram No. 2 shows the rocker, l5, ele- \ated one half inch above the first position and shows also. a corresponding shortening of the comparative spaces, 2 to 4- and-G to 8.

Diagram No. 3 shows the comparath'e re sults obtained by an additional elevation of the rocker, and this might be continued to other diagrams of any similar character, but the showing of which is not thought to be necessary.

The long intersecting line, 9, represents the center of travel of the rocker, and it will be observed that as the rocker is elevated a line from D to the intersecting line, 9, and thence to the center of the circle, A, will show a gradual approach to a right-angle and a consequent diminution of the diiferential or progressive stroke.

The object of a reciprocatingprogressive motion as applied to a concentrating table, is to separate the heavier and more valuable contents of a properly crushed ore from the lighter and less valuable gangue matter in which it is contained. For this purpose,

some have heretofore em loyed a mechanical arrangement usually cal ed a concentrating table or a vanner. My invention is directly related to the concentrating-table type of these machines and particularly to a table which may be described as follows, reference being bad to Figs. 1, 2 and 3 of the drawings. Fig. '1 shows a side elevation of the complete table, T, mounted upon appropriate base timbers and connected to the head motion or reciprocating meehrnism which has heretofore been described. The main body of this table consists of a substantially rectangular frame, T whichmay be five feet wide by fourteen feet long, although any other desired width or length may be employed. The table has a smooth bed or plain surface, If, and parallel side pieces, 35, as is common in such tables. The ends are left open, the front end, which in the present showing is the end most removed from the head-mechanism, being the concentrating-discharge end and the back or end nearest the head-mechanism being for the discharge of tailings or waste matter. \Vhen the table is in motion, it moves in a line longitudinally with the head-motion and has reciprocating or backward and forward motion, the length and'charact-er of which is determined by the adjustment of the head--mechanism before mentioned and to which is attached the connecting rod, 34, leading from the tailings-discharge end of the table. Mounted upon the main body ofthe table, as shown in Fig. 1, are a series of parallel horizontal planes or supplemental tables, 36, 37 and 33, and which parts I will hereinafter refer to as ad'- ditionaluplanes. Theyare approximately -pose of feeding and distributing the crushed ore to the underlying plane, 38, as it is con- 'veyed to the feed-box in its carrying medium, water, by a proper pipe or launder.

which there may be any desired number, are supported by sectional brackets, 40, shown particularly in Figs. 1 and 3, said brackets being bolted to the main frame, T of the table, and they are so constructed that any number of these brackets may be supported one on the other and securely bolted together whereby the vertical height of thesuperposed groups of additional planes may be determined at will and Without any substantial alteration of the concentrating mechanism. The brackets may also be used to adjust the'position bf the added planes to any degree of inclination other than that of the main table, without departing from the spirit of the invention.

This may be done by using brackets of varying heights.

To acilitate the movement and adjustment of. the table and its supporting frame,-

together with the super-imposed planes, the said table is mounted upon rockers or legs, of which three, 41, 42, and 43, are shown, but it will be understood that there are three ofthese rockers or legs upon each side of the table. One oft-he legs (41-cl3) will be. placed at each side, near each end and one (42) placed at each side near the middle, as shown in Fig. 1, the said legs being each pivotally secured at their 'upper ends to appropriate bearings,'44, 45and 46,

- The additional planes, 36, 37and 38 and of fixed to the underside of the table frame.

The legs or rockers are preferably provided with horizontal inward y extending wings or portions, 41', 42 and 43, near their upper ends. and which portions are pierced to receive the transverse rods, 47, which form the pivots about which, the upper ends ofthe legs or rockers oscillate, said rods having collars, 48, which abut the wings or extensions of the rockers and thereby prevent side movement when the table is in operation, thus holding the table so that it may reciprocatein a true longitudinal direction. At the lower ends, the legs or rockers, 41 and 43, at the end portions of the table are also pivotally c'onnected to suitable bearing ,7 blocks.'49, the lower portions of which are provided with inclined foot-pieces, 50, Which are adapted to rest in engagement with appropriatewedges, 51, and 52, there being fourof these wedges, one located at each' corner of the machine, as shown in Figs. 1 and 2. The lower bearing of the middle action.

of which is threaded and provided with jam-nuts 55, in der that the position of these wedges may be change'd'at pleasure for the purpose of leveling and. adjusting the table in its relation to other bearings. The four Wedges (there are two at each side of the machine) and the rocker bearings, 49, which they support, are held inuplace by slotted standards or guides, '56, and 57,

which standards or guides are bolted to the foundation sills 58, which also support and are bound together by the main longitudinal timber, 59, which extends beyond the .mar end of the table and also furnishes a support for the head-mechanism first above mentioned, to which extended portion of the support the base of the supporting frame of the head-mechanism is secured in any appropriate manner.

Referring again to Fig. 1, it will be seen that there is employed a heavy coiledspring, 60, which is supported at one end by a bracket, '61, bolted or otherwise secured to the main longitudinal timber of the base support, the opposite end of said spring resting against a suitable bracket, 62, which is bolted ,to the underside of the table frame and extends downwardly to the corresponding end of the spring. In order that the tension of the spring may be increased or lessened as desired, each of the'braekets, 61 and 62, is provided with an adjusting screw, 68, and 64; the object of the aforesaid spring is to assist the quick responsive'aetion of the table, as said table is actuated by the headmechanism and to take up all lost motion occasioned by loose connections.

In order that the wedges, 51, 52, may be adjusted in unison from a convenient point I employ a hand lever, 65, which is mounted on a rocker shaft, 66, extending transversely across the base of the machine, and is mounted in appropriate bearings thereon, said shat't being provided with downwardly extending arms, or levers, 67, each of which is connected to an appropriate clamp, '68, which firmly engages the horizontal rod, 54, each of said arms or levers being connected to a clamp by means of a distance bar, 69. The lever just mentioned enables me to adjust the longitudinal inclination of thetable by shifting the horizontal rod, 54, with its attached wedges, to that precise angle required in eii'ccting the separating or concentrating function of the table when in 3y moving the upper end of the lever, 65, forward, or toward. the front of the machine, or that part of the machine over which the concentrates are discharged, the rods, -54, of which there will be one on each side of the machine, are moved back ward, causing one of the wedges at each side to raise the front end of the concentrating table, as its connections slide inthe guides or slotted standards, 56, the rear end of the table being at the same time caused to drop a corresponding distance because of the bearing blocks, 49, at this'end'of the table moving down the declining portions of the Wedges, it being observed that. the wedges at opposite ends of the table are placed with as one set .of wedges raiseone portion of the table, the other set of wedges permit the other endof-the' table to be correspondingly lowered, the bearing blocks,-which rest in contact with the wed es beingslidably mounted in the slotte standards before be given any angle of inclination desired wedges at each end of the table may be raised and lowered in unison to efiect the the same side of the table may be operated to adjust the table transversely for'leveling purposes, as will be readily understood by 'one' skilled in this art. When the lever, 65, is moved in the opposite direction from that and reduces the inclinationof, the table to any point down to an absolute level.

The table end of-the rod, 34, is threaded and is provided with jam-nuts, 71, and 72, valso with a backing-spring, 73, said rod passing through a bracket, 74, secured to land extending from the underside of the table, and said jam-nuts, 71 and 72 enabling the operator to adjust the position of the table so that the rockers or legs, 41 ;42 and 43, shall be in the proper vertical position, it being understood that the adjustment of these nuts, 71 and 72, in one direction shortens up on the rod and thus results in the-table being moved toward the head. mechanism and the .rockers being caused to assume a more or less vertical position.

The table is shown as having the end next to the head mechanism provided with a .for the purpose of catching the flow of -waste, as it passes oil of the table and to convey it to one side and into a proper re- ,ceiver, not shown.

At the head end of the table or that end over which the concentrates are delivered, is. mounted a horizontal transversely extending perforated pipe, 75, adapted to deward and oil of the table. A similar spraytheir inclines'in reverse directions so thatmentioned. By this method the table can within the range of the apparatus; the f longitudinal inclination and the wedges at described it reverses the action of the wedges waste or tailings launder, L, whichis placed liver dressing-water for the purpose of. cleaning the concentrates as they pass for pipe, 76, may also be connected to each of the added planes, 36, 37 and 38,-as shown by dotted lines, in Fig. 1.

An eccentric shaft, 77, passes transversely across the table frame and beneath the table surface at the head end of the same, as shown in Figs. 1. and 7, and the outer end of this shaft is connected with a hand lever, 78, by the movement of which the shaft is turned to bring the eccentric portion up under the table and to thereby give an additional elevation of say if of an inch, or any part thereof, in two feet, as shown by dotted lines in said Fig. 7, without changing the general inclination of the table, or the superimposed plane or planes, it being under stood that the table surface is so constructed as to be sufliciently flexible to permit of thus springing or otherwise moving a portion at the head end into a different inclination from that which the balance of'the table has and which portion of the table may be caused to assume its normal position in line with the balance of the table, by turning the hand lever to bring the eccentric portion of the shaftout of engagement with I the'bottom of the movable portion-of the table proper. A similar'eccentric shaft, 79, may also be provided for each of the added planes, 36, 37, and 38, and for the purpose above stated.

In Figs. 1 and 3', I show a feed box, 39, which is mounted above. the uppermost 'added plane; in said Fig. 3, the table is also shown as being provided with a truss brace, 81.

The added planes may be each progressively longer than the other as shown in Fig. 1, or the planes may be of substantially the same length but arranged in overlapping planes in which case the end of the added planes nearest the head end of the machine will terminate approximately at the dotted line, 82, in said figure.

lVhile the drawings show the added planes as being disposed above the concentrates-end of the table, I do not limit the invention to these added planes as being essential to this particular portion of the table, as it will be obvious to one skilled in this art, that said added planes may be placed in other positions relative to the table, and still be within the scope of my invention.

The general operation of my invention may be described as follows: The headmechanism being connected to the power line by belt and the speed regulated to the re quired number of revolutions per minute which may vary according to requirements from 2 20 to 3:30, more or less, the table is 'given a longitiulinalinclination from the concentrates discharge end down tpward the tailings discharge end andhaving been previously leveled at right to its inclination, it is ready to receive the crushed ore 'ume is spread and delivered. onto the firstor upper plane, which is directly under the feed-box in a uniform and steady stream, extending" across the entire width of the plane. with the concentrating surfaces of the table, and at this point a portion or all of the free mineral may be eliminated from the accompanying water and gangue matter by the reciprocat-ing and progressive action imparted to the table by the head-motion. This reciprocating and progressive action in its effect may be described as follows: The reciprocating action 'of the table whep the vibrations are sufiiciently rapid, impart these vibrations to the mass of mixed sands, mineral particles, and water as it is deposited upon the several plane surfaces of the table, and as a result of its vibrating movement the particles are kept in constant motion loose and free from any tendency to pack and become solid. In this condition the pulp is allowed to [low freely from the feedbcX and drop upon the surface below. As in all cases (with few, if any, exceptions) the more valuable lnincralparticles of the pulp are those ofthe greatest specific gravity their greater weight carries them through the moving mass of sand particles and brings them in contact with the moving surface of the first plane. Here the influence of the piogressive or differential quality of the reciprocating movement becomes at once apparent. At the instant of contact, the particles of solid matter commence to move forward toward the concentrates discharge end, because the return movement of the table toward the head-motion or actuating mechanism being quicker than the forward, away from the head motion, the surface upon which the mass rests is jerked from beneath it before the inertia of the mass is overcome bythereturn motion. This movement re-' peated with great frequency causes the mass to travel with greater or less speed according tothe adjustment toward the forward or concentrates discharge end of the table. As

it is not desired to bring forward the whole mass, but only the more valuable and heavier mineral particles, the table and its added planes are given as previously stated, an inclination from the concentrates discharge end downward toward the tailings discharge end. Theelfect of this inclination is that when it is adjusted to the proper degree of pitch, the lighter and less valuable particles will flow or roll under the influence of the volume of water in which it is contained,

aided by the inclined surface toward the tailings discharge end, this action being rendered easier and more positive by the v1brat- This is the point of first contact tial or progressive movement in combination concentrates as they advance,

with the adjustment of the inclination of the plane surfaces of the table and the speed or" number of strokes imparted to the table and plane surfaces in a given period of time. The nearer the sands and mineral particles approach each other in their factors of specific gravity, thecloser must be the adjustments of the operation to effect thcir'separation, and as apertect separation is seldom if ever obtained in one operation under ,con-.

ditions oat even the most perfect adjustment,

- Ihave conceived the idea of repeating the operation'as many timesas may be found profitable before allowing the pulp to pass off of the machine. lVit-h this end in view I have addedthe superimposed planes heretofore mentioned and more particularly shown in Figs. 1 and 2, from which figures'it will be seen that as the pulp flows from the feedboX on to plane No. 1 where the first concentrating action takes place, the tailings drop onto plane No. 2 for the second process of concentration thence toplane No. 3 for the third process, thence onto the main table for the fourth and last process, from which the residual tailings are allowed to go to waste or to be conveyed to some other apparatus for further treatment.

From the foregoing it will be seen that the main and additional concentrating planes or surfaces aiiord a means of con centrating and separating difli'erent min- .erals, such zinc producing each separate mineral from a difi'erent planeg'to illustrate, I will say that a lead concentrate may be obtained from plane No. 1, an iron concentrate from )lane, No. 2,.a zinc concentrate from plane No. 3 and the middlings or mixed product from the main table bed.

By the arrangement as shown, itis intended that the operator may have the option otplacing uponthe table, one, two, three, or as many planes as the conditions of the ore may" require.

It will be noted that the concentrateseend ofithe main table bed is provided with the spray pipe, for the purpose of washing the and cleaning them of any desirable gangue matter that 'may be carried forward with them. It will for example as lead, iron, and

also be noted that this end of the table' is i" provided with the adjusting eccentric, ,by' which an additional jinclination, may g ven to this end ot'the table, more par ticularly shown in Fig. .7. Both of these appliances may be attached to the added planes above and it is intended to so use them whenever and wherever it may be found advisable;

I do 'not confine myself to any particular width or-len h of either the main table, for the added p anes above. I do; not confine myself to the distance which one plane may I be-placed' above thetable or anyot-her plane, I do not confine myself to any iven' position, longitudinally which one p ane-may have i relation to the main table'or another plane. I donot confine myself to the man-. ner in which the pulp flows' trom one plane to another". It may be conveyed forward from the rear end of one plane, and underneath to any point on the ncXt lower plane. The concentrates may be conveyed from any plane to a proper receptacle or' drop on the next lower plane or to thesurface' of the main table for ire-treatment.

I do not claim in this application the means shown and described for imparting the operating and progressiveaction to the concentrating table, as this part of my invention forms the claimed subject-matter. of a separate application filed by me of even date herewith.

Having thus described my invention what Iclaim as new and desire-t0 secure by Letters Patent, is

a 1. A shaking table having supports at the ends and central portion, said table being transversely horizontal and said supportsing rockable in the direction of the length of the table, the central supports having con nections adapted to restrain the vertical dis placement of the central portionof the table, means to restrain the supports from movement transversely of the table, and means for shaking the table.

3. The combination of a concentrating table, supplemental concentrating planes, or

surfaces arranged in superposed order thereover, said planes or surfaces affording a means performing a plurality of independent complete concentrating operations at the same time in one machine, rockable supports at the sides and central portion of the table, said table being transversely horizontal; and saidisupports being r'ockable in the direction of the length of the table, means to restrain the supports from movementtransversely of the table, the central supports having stationary bearings for pre serving the central longitudinal positionof the table by rest-raining the vertical displace ment thereof, means to restrain the supports from movement transversely of the table, the supplemental plan having rigid connections with the tabl adapted to prevent distortion and to transmit movements of the table to said planes, and means for reciprocating said table.

' 4. The combination of shaking table, rockable supports at both sides of the ends and central portion 4 thereof, said table being transversely horizontal and said supports being rockable in the direction of the length" of the table, the central supports having connections adapted to restrain the vertical displacement of the central portion of the table, means to restrain the supports from movement transversely of the table, and.

means at one end of the table for imparting to said table a reciprocating and differential motion.

5. In combination, a longitudinally tiltable table, supports at the ends and intcrn'icdiate portion thereof comprising rockers, the intermediate rockers having stationary bear-- ings and being connected to the bearings and the table to restrain vertical displacement of the central portion of the table, means engaging the rockers at the ends of the table and adapted to impart simultaneo-us opposite movements at opposite ends or" the table to said rockers, and means for reciprocating the table.

6. In combination, a longitudinally tiltable table, supports at the ends and intermediateportion thereof comprising rockers, the intermediate rockers having stationary bearings and. being connected to the bearings and the table to restrain vertical displacement. of the central portion of the table, means engaging the rockers at the ends of the table and adapted to impart simultano ous opposite movements at opposite ends of the table to said rockers, said means comprising connected raising and lowering mechanism forming supports "for the end rockers, and means for reciprocating the table.

7. In combination, a longitudinally tiltable table, supports at the ends and intern'iediatc portion thereof, said supports comprising rockers movable in the direction of the length of the table, the intermediaterockers having connections adapted to restrain the vertical displacement of the central portion of the table, means to restrain the rockers from movement transversely of the table,

- and means engaging the rockers at the ends of the table and'adapted to impart simultanoous opposite vertical movements to the rockers at opposite ends of the table, said last-named means forming supports for the end rockers, and means for reciprocating the ta ble in the direction of its length.

8. The combination with a transversely horizontal shaking table having rockable supports at the ends and central port-ion, said supports being rookable in the direction of the length of the table and the central supports having connections adapted to re strain the vertical displacement of the central portion of the table, supplemental concentrating planes arranged in superposed order over said table, each of said planes constituting a separate and distinct concentrating surface which delivers a concentrated product of a given mineral. each suc ceeding supplemental plane receiving pulp from the plane above itand adapted-to concentrate from this pulpa finished product, said supplemental planes having. rigid connections With the table adapted to prevent distortion and to transmit movement of the table to said planes, and means for reciprocating said table.

9. In combination, a shaking table, means for supporting the table, said means including a rocker at the central portion of each side of the table, other rockers at each end of opposite sides of the table, said rockers being movable in the direction of the length of the table, means to restrain the rockers from movement transversely of the table, said central rockers having stationary bearings for preserving the central longitudinal position of the table by restraining the vertical. displacement thereof, pivotally connected bearing blocks at the lower ends of said end rockers, vertical guides in which the hearing blocks operate Wedges engaging said movable bearing blocks, and means for operating the Wedges in series, the Wedges at opposite ends of the table being reversely arranged whereby one end of the table is lowered when the other is raised and the longitudinal adjustment of inclination of the table is afforded While the central longitudinal position of said tableis preserved constant, and means for reciprocating the table.

10. The combination of. a concentrating table, supplemental concentrating planes or surfaces arranged in superposed order thereovcr, said planes or surfaces'atl'ording a means perft'irming a plurality of independent complete concentrating operations at the same time in one machine, rockable supports at the sides and central portion of the table, said tabl being transversely horizontal and said supports being rockable in the direction of the length of the table, means to restrain the supports from movement transversely of the table, the central supports having stationary hearings for preserving the central longitudinal position of the table by re strainingthe vertical displacement thereof, means to restrain the supports from movement transversely of the table, thesupplemental planes having rigid connections with the table adapted to prevent distortion and to transmit movements of the table to said planes, and means for-reciprocating said table, each of said supplemental planes being provided with means whereby said planes and each of them may be independently adjusted at different angles to longitudinal inclination thereby increasing or decreasing the frictional resistance to a progressing body of concentrates moving thereon, the degree of such frictional resist ance or hindered progression being d etermined by the angle of elevation of said planes in the; relation of said angle or angles to the are described by said rockable supports,

Copies of this patent may be obtained for five cents each, by addressing tiie' Cominissi'o neroi intents, Washington, D.'0.

In testimony whereof I aiiiX my 'signatiire 

